They are sleek KG fighters that patrol the skies around the KG war factory. It is hard to get a proper visual but they aren't very large and are a dark red color. They will fire rather standard blasts and just fly around on an apparently random flight path.
Their speed enables them to easily outmaneuver a HellCat cruiser's guns but they are very vulnerable to torpedo attacks, though they never stop coming. As soon as the sky was cleared they were already back, so it was best for Jak to ignore them unless they were between him and the target.